Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/4892
DC Field | Value | Language |
---|---|---|
dc.contributor.authorall | Etiope, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.authorall | Feyzullayev, A.; Geology Institute of the Azerbaijan National Academy of Sciences, Baku, Azerbaijan | en |
dc.contributor.authorall | Baciu, C. L.; Babes-Bolyai University, Faculty of Environmental Sciences, Cluj-Napoca, Romania | en |
dc.date.accessioned | 2009-02-11T07:51:26Z | en |
dc.date.available | 2009-02-11T07:51:26Z | en |
dc.date.issued | 2009-02 | en |
dc.identifier.uri | http://hdl.handle.net/2122/4892 | en |
dc.description.abstract | A global database of gas composition and methane stable isotopes of 143 terrestrial mud volcanoes from 12 countries and 60 seeps independent from mud volcanism from eight countries, was compiled and examined in order to provide the first worldwide statistics on the origin of methane seeping at the earth’s surface. Sixteen seep data were coupled with their associated subsurface reservoirs. The surface seepage data indicate that at least 76% of the mud volcanoes release thermogenic gas, with only 4% biogenic and 20% with mixed character. The average (201 data) of methane concentration and methane carbon isotope ratios (δ to the power of 13 C1) of mud volcanoes are 90% v/v and -46.4‰, respectively. The other types of seeps, which are independent from mud volcanism, have an average δ to the power of 13 C1 value that is slightly higher (-42.9‰). Gases from mud volcanoes are generally lighter (more methane, less ethane and propane) than their associated reservoir gases, suggesting a molecular fractionation during advective fluid migration. Other types of seeps, especially "dry" seeps, maintain the reservoir C1/(C2 + C3) "Bernard" ratio. Mud volcanoes behave like a "natural refinery" and the origin of gas more isotopically enriched than -50% and with C1/(C2 + C3) >500 should be attributed to a thermogenic source, rather than partial oxidation of biogenic gas. Some data that appear biogenic in the "Bernard diagram" can be explained by molecular fractionation of mixed gas. Consequently, the "Bernard" parameter may be misleading when applied to mud volcanoes since it does not always reflect the original gas composition. The mechanisms of the molecular advective segregation should be studied quantitatively by specific models and experiments. | en |
dc.language.iso | English | en |
dc.publisher.name | Elsevier Ltd. | en |
dc.relation.ispartof | Marine and Petroleum Geology | en |
dc.relation.ispartofseries | 3 / 26 (2009) | en |
dc.subject | Mud volcanoes | en |
dc.subject | Seeps | en |
dc.subject | Methane | en |
dc.subject | Isotopes | en |
dc.subject | Organic geochemistry | en |
dc.title | Terrestrial methane seeps and mud volcanoes: A global perspective of gas origin | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 333-344 | en |
dc.subject.INGV | 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases | en |
dc.identifier.doi | 10.1016/j.marpetgeo.2008.03.001 | en |
dc.description.obiettivoSpecifico | 3.8. Geofisica per l'ambiente | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | reserved | en |
dc.contributor.author | Etiope, G. | en |
dc.contributor.author | Feyzullayev, A. | en |
dc.contributor.author | Baciu, C. L. | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.department | Geology Institute of the Azerbaijan National Academy of Sciences, Baku, Azerbaijan | en |
dc.contributor.department | Babes-Bolyai University, Faculty of Environmental Sciences, Cluj-Napoca, Romania | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.dept | Geology Institute of the Azerbaijan National Academy of Sciences, Baku, Azerbaijan | - |
crisitem.author.orcid | 0000-0001-8614-4221 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
MarPetrGeol_2009_Etiope.pdf | main article | 622.05 kB | Adobe PDF |
WEB OF SCIENCETM
Citations
10
126
checked on Feb 10, 2021
Page view(s) 20
294
checked on Apr 20, 2024
Download(s)
40
checked on Apr 20, 2024